Arcadefight will give you an Energy Sword to spawn with. So find a Grunt and slice him up. Want to go solo? Scoreattack and Scoreattack x2 will give you some Sword wielding elites in the last round. Swap and stab. Then lay back and enjoy some Chimichangas... Chimicherries... Cherrychangas Chimicherrycangas pickle barrel kumquat... Sorry bout that.

Iron Will - Complete a Campaign mission alone on Heroic or harder with the Iron Skull on - 2500cR